(19) |
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(11) |
EP 2 040 388 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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11.04.2012 Bulletin 2012/15 |
(43) |
Date of publication A2: |
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25.03.2009 Bulletin 2009/13 |
(22) |
Date of filing: 24.04.1998 |
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(51) |
International Patent Classification (IPC):
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(84) |
Designated Contracting States: |
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AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
(30) |
Priority: |
24.04.1997 JP 12378297
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(62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
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07014599.0 / 1843483 |
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98917680.5 / 0978958 |
(71) |
Applicant: NTT MOBILE COMMUNICATIONS NETWORK INC. |
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Minato-ku,
Tokyo 105-8436 (JP) |
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(72) |
Inventors: |
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- Tamura, Motoshi
Tokyo 100-6150 (JP)
- Miki, Mutsumaru
Tokyo 100-6150 (JP)
- Okamoto, Akiko
Tokyo 100-6150 (JP)
- Kusunose, Kenya
Tokyo 100-6150 (JP)
- Uchikoshi, Akihiro
Tokyo 100-6150 (JP)
- Igarashi, Daisuke
Tokyo 100-6150 (JP)
- Yamagata, Katsuhiko
Tokyo 100-6150 (JP)
- Sato, Takaaki
Tokyo 100-6150 (JP)
- Hagiwara, Junichiro
Tokyo 100-6150 (JP)
- Watanabe, Yasuyuki
Tokyo 100-6150 (JP)
- Hamajima, Takuya
Tokyo 100-6150 (JP)
- Hata, Masafumi
Tokyo 100-6150 (JP)
- Ishikawa, Nobutaka
Tokyo 100-6150 (JP)
- Yasuda, Yoshiyuki
Tokyo 100-6150 (JP)
- Yunoki, Kazufumi
Tokyo 100-6150 (JP)
- Uchiyama, Nobuhide
Tokyo 100-6150 (JP)
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(74) |
Representative: Spilgies, Jan-Hendrik |
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Hoffmann Eitle
Patent- und Rechtsanwälte
Arabellastrasse 4 81925 München 81925 München (DE) |
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(54) |
Method and system for mobile communications |
(57) The present invention relates to a method for determining a radio zone and an uplink
transmission power, comprising transmitting, by each of base stations, broadcast information
via a corresponding perch channel, the broadcast information indicating a specified
channel transmission power level and an uplink interference level; and receiving,
by a mobile station, the broadcast information from near base stations around the
mobile station; detecting, by the mobile station, respective reception levels of the
perch channels for the near base stations; calculating, by the mobile station, respective
path losses between the mobile station and respective near base stations on the basis
of the respective reception levels and the respective specified channel transmission
power levels indicated by the broadcast information; calculating, by the mobile station,
respective necessary uplink transmission power levels between the mobile station and
respective near base stations on the basis of the calculated respective path losses,
the respective uplink interference levels indicated by the mobile station, the broadcast
information, and required signal-to-interference ratios involved in reception by the
near base stations; selecting, by the mobile station, a radio zone in which the necessary
uplink transmission power level is minimum among the respective necessary uplink transmission
power levels, the base station of the selected radio zone being ready for communication
with the mobile station or being able to commence communication with the mobile station
after handover; and controlling, by the mobile station, an uplink transmission power
in the selected radio zone based on the necessary uplink transmission power level
of the selected radio zone.